Network Card problems! Need help.

I bought a new computer a few months back, and its great, however it got a flaw

Every now and then my Network Card get disabled by itself and I lose my internet connection, I have tried everything that I can come up with.

What happens is: I got the following programs up; ventrilo, firefox and a random online game, like WoW, HoN or MW2. Suddently my network disables it self and I have to deactivate it and activate it again before my internet connection comes back.

FYI: I have tried updating the driver and I have tried checking off the power management tab under network card's device manager...

That almost sounds like a driver issue to me, but you said you'd updated it. If it randomly appears and disappears from Device Manager, then it may be a hardware flaw if the driver is actually working properly.